no rule to make target for importing existing CMake project

I am trying to import a project with C++ files that I already built using cmake and makefile. I am trying to import it into QT creator. However, after importing the project and trying to debug it, I get the error "no rule to make target". However, the file it is referring to exists and I never had this problem with that file when using cmake. What is going on?

When I did Try File -> Open File or Project and select the existing CMakeLists.txt file in Project/src/Project/ and then had Qt Creator use cmake to build it, I get the error "CMake Error at CMakeLists.txt:165 (SetupBoost): Unknown CMake command "SetupBoost".

I generated the makefile (before using Qt) by going to ws/mke48/cmake/Project/Build, running 'ccmake' with the CMakeLists in the root source folder, pressing 'c' for configure, 'g' to generate the makefiles, 'make', 'ccmake' again, setting PRE_BUILD to false/off, 'c' again, 'g' again, and 'make' again